An unidentified flying object (UFO), or unidentified anomalous phenomenon (UAP), is any perceived airborne, submerged or transmedium phenomenon that cannot be immediately identified or explained. Upon investigation, most UFOs are identified as known objects or atmospheric phenomena, while a small number remain unexplained.
UFO conspiracy theories are a subset of conspiracy theories which argue that various governments and politicians globally, in particular the United States government, are suppressing evidence that unidentified flying objects are controlled by a non-human intelligence or built using alien technology. Such conspiracy theories usually argue that Earth governments are in communication or cooperation with extraterrestrial visitors despite public disclaimers, and further that some of these theories claim that the governments are explicitly allowing alien abduction.
Kenneth Albert Arnold was an American aviator, businessman, and politician.
On 7 January 1948, 25-year-old Captain Thomas F. Mantell, a Kentucky Air National Guard pilot, died when he crashed his P-51 Mustang fighter plane near Franklin, Kentucky, United States, after being sent in pursuit of an unidentified flying object (UFO). Mantell pursued the object in a steep climb and disregarded suggestions to level his altitude. At high altitude, he blacked out from a lack of oxygen; his plane went into a downward spiral and crashed. The incident was among the most publicized of early UFO reports. Later investigation by the United States Air Force's Project Blue Book indicated that Mantell died chasing a Skyhook balloon, which, in 1948, was a top-secret project that he would not have known about.
The extraterrestrial hypothesis (ETH) proposes that some unidentified flying objects (UFOs) are best explained as being physical spacecraft occupied by extraterrestrial intelligence or non-human aliens, or non-occupied alien probes from other planets visiting Earth.
The Maury Island incident refers to claims made by Fred Crisman and Harold Dahl of falling debris and threats by men in black following sightings of unidentified flying objects in the sky over Maury Island, Washington, United States. The pair claimed that the events had occurred on June 21, 1947. The incident is widely regarded as a hoax, even by believers of flying saucers and UFOs.
The Robertson Panel was a scientific committee which met in January 1953 headed by Howard P. Robertson. The Panel arose from a recommendation to the Intelligence Advisory Committee (IAC) in December 1952 from a Central Intelligence Agency (CIA) review of the U.S. Air Force investigation into unidentified flying objects, Project Blue Book. The CIA review itself was in response to widespread reports of unidentified flying objects, especially in the Washington, D.C. area during the summer of 1952.
Project Sign or Project Saucer was an official U.S. government study of unidentified flying objects (UFOs) undertaken by the United States Air Force (USAF) and active for most of 1948. It was the precursor to Project Grudge.
The Mariana UFO incident occurred in August, 1950 in Great Falls, Montana. The sighting, filmed by local baseball coach Nick Mariana, is believed to be among the first ever motion picture footage of what came to be called an unidentified flying object (UFO). The U.S. Air Force, after a short investigation, concluded that what Mariana had actually filmed were the reflections of two F-94 jet fighters, a claim that the Air Force would later retract.
The Levelland UFO case occurred on November 2–3, 1957, on the highways around the small town of Levelland, Texas. Levelland, which in 1957 had a population of about 10,000, is located west of Lubbock on the flat prairie of the Texas South Plains. The case is considered by ufologists to be one of the most impressive in UFO history, mainly because of the large number of witnesses involved over a relatively short period of time. However, both the US Air Force and UFO sceptics have described the incident as being caused by either ball lightning or a severe electrical storm.
The Westall UFO was a reported UFO sighting in Australia that occurred on 6 April 1966 in Melbourne, Victoria. The object was observed by multiple individuals, including students at Westall High School. Specific details vary between accounts, which increases the difficulty of identification. The sighting has been commemorated with documentaries, reunions, and a local UFO playground.
From July 12 to 29, 1952, a series of unidentified flying object (UFO) sightings were reported in Washington, D.C., and later became known as the Washington flap, the Washington National Airport Sightings, or the Invasion of Washington. The most publicized sightings took place on consecutive weekends, July 19–20 and July 26–27. UFO historian Curtis Peebles called the incident "the climax of the 1952 (UFO) flap"—"Never before or after did Project Blue Book and the Air Force undergo such a tidal wave of (UFO) reports."
A flying saucer, or flying disc, is a purported disc-shaped UFO. The term was coined in 1947 by the news media for the objects pilot Kenneth Arnold claimed flew alongside his airplane above Washington State. Newspapers reported Arnold's story with speed estimates implausible for airplanes of the period. The story spurred a wave of hundreds of sightings across the United States, including the Roswell incident and Flight 105 UFO sighting. The concept quickly spread to other countries. Early reports speculated about secret military technology, but flying saucers became synonymous with aliens by 1950. The term has gradually been supplanted by the more general military terms unidentified flying object (UFO) and unidentified anomalous phenomena (UAP).
On June 24, 1947, private pilot Kenneth Arnold claimed that he saw a string of nine, shiny unidentified flying objects flying past Mount Rainier at speeds that he estimated to be at least 1,200 miles per hour (1,900 km/h).
UFOs: Past, Present, and Future is a 1974 documentary film that examines several prominent UFO sightings from the post-war to contemporary era. It was re-released in 1976 and 1979 under the title UFOs: It Has Begun to coincide with renewed interest in the subject due to the release of Steven Spielberg's Close Encounters of the Third Kind. It is based on the book UFOs: Past, Present, and Future by Robert Emenegger.
The Coming of the Saucers is a 1952 book by original 'flying saucer' witness Kenneth Arnold and magazine publisher Raymond Palmer. The book reprints and expands early articles the two had published in Palmer's magazine Fate. The work blends first-person accounts attributed to Arnold with third-person summations of UFO reports.
The Rhodes UFO photographs, sometimes called the shoe-heel UFO photographs, purport to show a disc-like object flying above Phoenix, Arizona, United States. The two photographs were reportedly taken on July 7, 1947, by amateur astronomer and inventor William Albert Rhodes. They were printed in the newspaper The Arizona Republic on July 9, along with Rhodes's account of his sighting of the object. Published near the end of the 1947 flying disc craze, the photographs were among the first showing an unidentified flying object. They continue to be discussed by commentators.
The Report on Unidentified Flying Objects is a 1956 book by then-retired Air Force UFO investigator Edward J. Ruppelt, detailing his experience running Project Bluebook. The book was noted for its suggestion that a few UFO sightings might be linked to spikes of atomic radiation. Contemporary media summarized four topics discussed in the book:
"Have We Visitors From Space?" was an article on Flying Saucers by H. B. Darrach Jr. and Robert Ginna that appeared in the April 7, 1952 edition of Life magazine. The piece was strongly sympathetic to the hypothesis that UFOs might be the product of extraterrestrials. Publicity surrounding the piece is believed to have contributed to the 1952 UFO flap, a subsequent wave of reports that summer.
On the night of January 29, 1952, amid the Korean War, four American military personnel aboard two different B-29 bombers reported seeing an orange globe-shaped light over two different cities in northern Korea: Wonsan and Sunchon. Air Force UFO experts argue that widespread reporting of the incident contributed to the 1952 UFO flap that culminated in sightings over the nation's capital.
